A bachelor of forty inherits a baronetcy and decides to write a philosophical treatise on the ordering of life - at which point a runaway Syrian girl arrives on his doorstep and life declines to be ordered. Locke was born in Barbados and kept an architect's ledgers for a decade before his fiction took hold; his speciality was the charming vagabond who ruins a sensible man's plans. Fifty-nine plates spanning 1795 to 1923, from Orpen and Lavery, catch the same collision of order and upheaval the story tells.